The Glowing fungus is a quest item used in the Haunted Minequest. It is used to light the way in the lower parts of the mine where fire-based light sources are extinguished and tinderboxes become damp tinderboxes by being dropped into a small pool, hence why a glowing fungus is needed.

Being used to growing in a very dark cave, the fungus is very susceptible to sunlight and will crumble to ashes if taken out of the confines of the mine. It crumbles when dropped, too.